1. Allison, E. (2004a). Religiously protected natural sites of Khumbu. In S. Subha & A.R. Sherpa (Eds.), Sacred sites trails project brochure. Kathmandu: The Mountain Institute (TMI).
2. Allison, E. (2004b). Spiritually-motivated natural resource management in eastern Bhutan. In K. Ura & S. Kinga (Eds.), The spider and the piglet (pp. 528–561). Thimphu: Centre for Bhutan Studies.
3. Anoliefo, G. O., Isikhuemhen, O. S., & Ochije, N. R. (2003). Environmental implications of the erosion of cultural taboo practices in Awka-south local government area of Anambra state, Nigeria: 1. Forests, trees, and water resource preservation. Journal of Agricultural & Environmental Ethics, 16(3), 281–296.
4. Berkes, F. (2008). Sacred ecology. New York: Routledge.
5. Bernbaum, E. (1990). Sacred mountains of the world. San Francisco: Sierra Club Books.